Sharepoint Thumbmail not diplaying

Hi all,

I don't know what has happened. It was working fine and then with no reason stopped. 

I was using powerapps to upload some pictures for the list items into Thumbmail / Image column. It was working fine. Now it doesn't. And even when I try to add it manually from sharepoint lists view it doesn't work either. 
That's what it displays now and at the bottom you can see it was working on previous ones (about 3-4 weeks ago).

I have also noticed change in the link structure, but I haven't changed a single thing. Can somebody explain why is that not working anymore? I needed it urgently today...